Account for the relationship as it is now
Use a tone that fits the present relationship, not the closeness, authority, or access that existed in the past. For a message about how to support someone during radiation treatment, use this factual base: acknowledge the diagnosis or treatment only as they described it and remember the practical burden around it.
Ask without assigning an obligation
Explain what you hope for while making decline, delay, or a different format genuinely acceptable. Offer one specific task, flexible company, or ordinary contact that they can accept or ignore. Make the immediate next step clear enough that the recipient can answer without reconstructing the entire history.
Keep the ending honest
Do not prescribe cures, compare outcomes, ask for optimism, or share their health information. Leave medical decisions to clinicians and contact urgent or emergency services when there is immediate danger. Avoid future promises, guilt, flattery, or nostalgia that imply the recipient owes you access.